class Mark:
    def __init__(self,x,y):
        self.x=x
        self.y=y
class Person:
    def __init__(self,name,age):
        self.name = name
        self.age = age
        self.landmark = []

person = Person("球球",18)
mark1 = Mark(10,20)
mark2 = Mark(30,50)
mark3 = Mark(40,60)
person.landmark.append(mark1)
person.landmark.append(mark2)
person.landmark.append(mark3)

for i,lm in enumerate(person.landmark):
    print(i,lm.x,lm.y)

